柯林斯词典diatom /ˈdaɪətəm, -ˌtɒm/ 1. N any microscopic unicellular alga of the phylum Bacillariophyta, occurring in marine or fresh water singly or in colonies, each cell having a cell wall made of two halves and impregnated with silica 矽藻類→see also diatomite 返回 diatom